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AD7390 датащи(PDF) 10 Page - Analog Devices

номер детали AD7390
подробное описание детали  3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7390 датащи(HTML) 10 Page - Analog Devices

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AD7390/AD7391
REV. 0
–10–
RESET (CLR) PIN
Forcing the CLR pin low will set the DAC register to all zeros
and the DAC output voltage will be zero volts. The reset func-
tion is useful for setting the DAC outputs to zero at power-up or
after a power supply interruption. Test systems and motor con-
trollers are two of many applications which benefit from power-
ing up to a known state. The external reset pulse can be
generated by the microprocessor’s power-on RESET signal, by
an output from the microprocessor, or by an external resistor
and capacitor. CLR has a Schmitt trigger input which results in
a clean reset function when using external resistor/capacitor
generated pulses. The CLR input overrides other logic inputs,
specifically LD. However, LD should be set high before CLR
goes high. If CLR is kept low, then the contents of the shift reg-
ister will be transferred to the DAC register as soon as CLR re-
turns high. See the Control-Logic Truth Table I.
UNIPOLAR OUTPUT OPERATION
This is the basic mode of operation for the AD7390. As shown
in Figure 26, the AD7390 has been designed to drive loads as
low as 5 k
Ω in parallel with 100 pF. The code table for this op-
eration is shown in Table IV.
+2.7V to +5.5V
0.1
µF
VOUT
CLR
SDI
CLK
LD
3
2
1
4
GND
REF
VDD
AD7390
7
6
5
10
µF
µC
RS
RL
≥ 5kΩ
CL
≤ 100pF
EXT
REF
0.01
µF
R
Figure 26. AD7390 Unipolar Output Operation
Table IV. AD7390 Unipolar Code Table
Hexadecimal
Decimal
Output
Number
Number
Voltage (V)
in DAC Register
in DAC Register
VREF = 2.5 V
FFF
4095
2.4994
801
2049
1.2506
800
2048
1.2500
7FF
2047
1.2494
000
0
0
The circuit can be configured with an external reference plus
power supply, or powered from a single dedicated regulator or ref-
erence depending on the application performance requirements.
BIPOLAR OUTPUT OPERATION
Although the AD7391 has been designed for single-supply op-
eration, the output can be easily configured for bipolar opera-
tion. A typical circuit is shown in Figure 27. This circuit uses a
clean regulated
5 V supply for power, which also provides the
circuit’s reference voltage. Since the AD7391 output span
swings from ground to very near
5 V, it is necessary to choose
an external amplifier with a common-mode input voltage range
that extends to its positive supply rail. The micropower con-
sumption OP196 has been designed just for this purpose and re-
sults in only 50 microamps of maximum current consumption.
Connection of the equal valued 470 k
Ω resistors results in a dif-
ferential amplifier mode of operation with a voltage gain of two,
which results in a circuit output span of ten volts, that is,
5 V
to
5 V. As the DAC is programmed with zero-code 000H to
midscale 200H to full-scale 3FFH, the circuit output voltage VO
is set at
5 V, 0 V and
5 V (minus 1 LSB). The output volt-
age VO is coded in offset binary according to Equation 4.
Equation 4
VO =
5
1
512
D
where D is the decimal code loaded in the AD7391 DAC regis-
ter. Note that the LSB step size is 10/1024 = 10 mV. This cir-
cuit has been optimized for micropower consumption including
the 470 k
Ω gain setting resistors, which should have low tem-
perature coefficients to maintain accuracy and matching (prefer-
ably the same material, such as metal film). If better stability is
required the power supply could be substituted with a precision
reference voltage such as the low dropout REF195, which can
easily supply the circuit’s 162
µA of current, and still provide
additional power for the load connected to VO. The micropower
REF195 is guaranteed to source 10 mA output drive current,
but only consumes 50
µA internally. If higher resolution is re-
quired, the AD7390 can be used with the addition of two more
bits of data inserted into the software coding, which would re-
sult in a 2.5 mV LSB step size. Table V shows examples of
nominal output voltages VO provided by the Bipolar Operation
circuit application.
DIGITAL INTERFACE CIRCUITRY OMITTED FOR CLARITY
OP196
BIPOLAR
OUTPUT
SWING
5V
5V
VO
< 50
µA
5V
AD7391
VOUT
GND
REF
VDD
C
470k
470k
5V
< 100
µA
ISY < 162µA
Figure 27. Bipolar Output Operation
Table V. Bipolar Code Table
Hexadecimal
Decimal
Analog
Number
Number
Output
In DAC Register
in DAC Register
Voltage (V)
3FF
1023
4.9902
201
513
0.0097
200
512
0.0000
1FF
511
-0.0097
000
0
-5.0000


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